Attachment for drilling machines



Dec. 4 1923. 1,475,982 J. F. BUHR v ATTACHMENT FOR DRILLING MCHINE v Filed vJuly `18 1921 Sheets-Sheet 1 me/nto@ jmgjfu 2 Sheets-Sheet 2 Ill,

J. F. EUHR ATTACHMENT FOR DRILLING MACHINES Filed July 18. 1921 III IIIII. .IIIIII IIIIII il Illlllll .IIIIII Dec. 4, 1923.-

l. l 3mm/m l Josefzz/m atroz nega Patented Dieci. 4, 1923. i

JOSEEH E'. EUHR, OF DETROIT, w/IICHIGAN.

ATTACHMENT FORl BRLLING MACHINES.

appiicatin tied July is,

To all whom t may con-cera: .v

Be it known that I, JOSEPH F. EUHR, a citizen of the United States of America, residing at Detroit, in the county of Viayne and State of Michigan, have invented certain new and useful :improvements in At-4 tachments for Drillingl Machines, of which the following is a specification, reference be-v ing had thereinto the accompanying drawings. ,Y Y ,Y

This invention relates to a -tool actuating attachment for drilling machines, and my invention aims to provide a simple and cth-- cient attachment whereby the direction of rotation of a tool holder may be readily reversed, so that the tap, bit or drill may be driven in a desired direction and when the direction of rotation is reversedfthe tap, bit or drill may be removed from a piece of f. work.

My invention further aims to provide a bit and tap chuck that is applicable to vari-` ous types of drilling machines, the chuck in Vits various form including an adapter associated with end thrust and lateral antifrictional so that there may be a uniform and easy transmission nof power from the drillin@ machine to the chuck.

Fly invention will be hereinafter de. scribed by aid of the drawings, wherein- Figure 1 is a vertical sectional view of the drilling attachment; Y

Fig. 2 is a horizontal sectional' view taken on the line II-II of Fig. 1;

V-Fig. 3 is a vertical sectionalA view of the attachment as designed for a socket member;

Fig. 4 is a similar View showing another design of the attachment, and

Fig. 5 is a vertical section of a spindle lifting device, that may be used in the chuck;

Fig. 6 is a horizontal sectional view of an intermediate gear ring or holder, and

Fig. 7 is a vertical section of the same.

Considering Figs. 1 .and 2, the reference numeral 1 denotes al cylindrical socket or housing having a bearing chamber 2 and a reverse gearing chamber 3, said bearing chamber `having its outer end closed by a plug or cap 4 screwed in the upper end of the housing 1, and the outer or lower end of the gear chamber 3 is closed by a plug or cap 5 screwed in the lower end of the housing 1 and held against accidental rotation therein by a set screw 6. l y

In the bearing chamber 2'are horizontally disposed anti-frictional bearings 7 and 8 is best shown in Fig. 2.

i921. serial No. 485,774..

spaced apart by asleeve spacer 9 between said bearings, and the bearing 7 abuts the plug. or cap 4.

Extending through the bearings 7 and 8, sleeve spacer 9, andthe plug or cap 4, is

an adapter .10 adapted to {it-in ak socket or Y socket member, vforming part of a drilling machine not shown.l The inner end ofthe adapter 10 is exteriorly.screwthreaded, as at 11, and provided with a clutch member 12 which has an axial bore 13. Y

Screwed on the adapter v10 and abutting the clutch member12 is thevr hub portion of van upper beveled gear .wheel 14 constantly meshing with intermediate beveled gear wheels 15 rotatable on radially disposed and inwardly projecting stud shafts 16,*carried by a gear ring, band or holder 17 detachably mounted within the gear chamber 3,1 Said gear holder being held against rotation byv a set screw 18 of the housing 1 extending into a slot 19 of the'gear holder.` The gear Vholderl having a slight vertical movement permits of the gear wheels 15 properly mesh-I ing with adjacent gear wheels.v

The intermediate beveled gear wheels 15.

constantly meshes with a lower beveled gear wheel 2O j ournaled in the plug or cap 5 withi suitable packing 21 about the gear wheel 20, between the gear holder 17 and the plug or cap .5, said packing retaining a, lubricant within the gear chamber 3.l The gear wheels ing gearing. Y I Axially of the lower beveled gear wheel 14, 15 and 2O constitute a substantial revers- 20 and screwed therein is a bushing 22, having its inner end provided with' a Vclutch member 23, confronting the clutch member 12 of the adapter 10. Thev clutch members 12 and 23 have transverse slots, one ofwhich Slidable in the bushing- Y22 is a spindle or member 24 of a chuck- 25,'and the linner end of 'the spindle 24has Va cross head 26 and 'a tang 27, said tang extendinginto the bore 13 Yof the adapterlOf so as to maintain the spindle 24- of the chuck 25 normally! inf alinement with the adapter 10 and axially of the housing v1. By reference to 2 it will be noted 'that the cross head 26 is provided with vertical contact faces adapted to confront and engage the side walls ofthe clutch member slots, so as to establish a positive driving relation between the cross head 26 and either of the clutch members 12 or 23. The housing 1 is provided with the usual v by reason of the cross head 26 engaging the Wheels.

clutch member 23. l/Vhen the spindle or member l24 and its chuck 25 are to be driven in the same direction as the adapter 10, the spindle 24 is elevated to place the cross head 26 in engagement With the clutch member 12', thus permitting the beveled gear v1wheels to idle While the spindle is driven direct from the adapter 10.

Reference will now be had to Fig. 3 showing the socket member 29 containing a socket 30 for the adapter 10 and in thisV instance the socket 30 has a'periph'eral flange 31 engagedY by an end thrust bearing 82 and a'lateralv anti-frictional bearing 33, said bearings and the socket 30 Vbeing retained Within `the socket member 29 by a plug or cap 84 into Ywhich extends the socket 30.

cap 34 is provided with suitable packingv and accidental rotation of the `cap is provided by a set screw 35 extendiiig through an opening 36 in a housing` 37, said housing being screwed or otherwise mounted on the lower 'end of theV socket member 29. ln this design of the'attachmentthe housing 37 is mounted exteriorly of the socket member 29, and in Fig. 4 I show a housing 38 which has the upper end thereof reduced, as 39 and adapted to screw into the lovver end orV the socket member 29 and replace the plug or cap 34,-shown in Fig.V 3. Y In' both of these designs the loiver end of the housing` contains the same mechanism previouslygfde scribed in connect-ion with Figs. 1 and 2.

Again referring to the gearrivheels 14, 15 and 20, constituting a substantial reversing gearing for the tapping chuck, the three gear Wheels may be mounted in a holder 40, as shown in Figs. 6 and T, said holder surrounding the clutch and constituting' a spacer between the upper and lower gear This holder may be a. die casting and a bench assembled structurethat may be readily mounted inthe socket.

Another feature. of my invention has been brought out in detail in Fig. 5, wherein the lower gear Wheel 2 0 has a cup shaped bushing 41 which affords theL usualclutch member. ln the bushing 41 is placed an end thrust bearing 42 and a coiled expansion Vspring 43, said spring surrounding the The plug or spindle ormember 24 so that the expansive force of said spring may hold the cross head26 oic the spindle or memiberin normal direct driving relation with the socket. As shown in Figs. 1, 3 and 4 thespindle or member 24 assumes 4an indirect driving'relation `to the socket by gravity, and in order that there may be a direct driving relation, l Without any chattering when tapping ai piece'oi Work the spring 43 is installed to hold the spindl'eor member 24 elevated,- in direct drive, except when withdrawing a 'tap from a. piece of Work. f

t is thought that the operation andy utility oi the drilling machine attachment will be apparent Without further description, and While in the drawing there are illustrated the preferred embodiments of my invention, it is to be understood that Ythe structural element-s arensusc'eptiblete suchV a clutch member in said housing, a chuck.v

spindle extending through said clutch member and adapted to be placed in engagement with either clutch member, and a reversing gear mechanism in said housing and operatively supported relative to said clutch members so that said chuck spindle may be driven the reverse ot said adapter.

2. The combination of a socket member,

Va socket in said member, an adapter in said socket, anti-frictionalV bearings Von said socket to resist end .and lateral thrust of said socket, a housing supported from said socket member, a spindle'extending into said housing and adapted to be driven by said adapter, and a reversing gear mechanism in said housing adapted to cause said spindle to be driven in reverse direction by said adapter.` Y,

In testimony whereof I aiiix-my signature f in presence of tivo Witnesses.

JOSEPH F. EUHR;

Witnesses: n f

KARL H. BUTLER, .ANNA M. Donn. 

